| abstract |
The invention relates to a method for producing a compound of formula (I), comprising the step of converting a compound that is selected from the group consisting of compounds of formulas (II), (III) or (IV), where X is halogen, in one or more stages with the formation of the compounds of formula (I). The invention also relates to a method for producing a pharmaceutical composition comprising a compound of formula (I) or a pharmaceutically acceptable salt or solvate thereof. Moreover, the invention relates to intermediates suitable for use in the above methods, as well as to methods for their preparation. |